TABLE 4.

Effects of Network Properties on Cocaine Use at 3 Months, United States and Australia

	Model 1			Model 2
Variable	Beta	Odds Ratio	95% Confidence Interval	Beta	Odds Ratio	95% Confidence Interval
Background characteristics
Age (years)	−0.08	0.93	0.73, 1.18	−0.07	0.94	0.75, 1.17
Gender (male = 1)	−0.29	0.75	0.34, 1.65	−0.49	0.61	0.27, 1.37
Site (United States = 1)	0.30	1.35	0.55, 3.31	0.25	1.28	0.51, 3.19
Baseline behavior (user =1)
Cocaine user	2.40**	11.01	5.11, 23.72	2.50**	12.20	5.68, 26.22
Network properties
Concentration of injecting friends	0.29	1.34	0.63, 2, 87
Change in concentration				0.76**	2.14	1.18, 3.89
Concentration of homeless friends	0.60*	1.82	1.01, 3.27
Change in concentration				−0.22	0.81	0.45, 1.45
Density	0.60*	1.81	0.91, 3.63
Hosmer-Lemeshow test
Chi-square	4.55			5.96
df	8			8
p > chi-square	0.80			0.65
−2 log likelihood	194.88			195.79

^*p < .05.

^**p < .01. One-tailed t test.